ZTE ZXDSL 931VII Netvigator Router Manual PDF (Setup & Configuration Guide)

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Chapter 18 Wireless Conﬁguration

802.1X uses an existing protocol, the Extensible Authentication

Protocol (EAP, RFC 2284), that works on Ethernet, Token Ring, or

wireless LANs, for message exchange during the authentication

process.

In a wireless LAN with 802.1X, a user (known as the supplicant)

requests access to an access point (known as the authenticator).

The access point forces the user (actually, the client software of

the user) into an unauthorized state that allows the client to send

only an EAP start message. The access point returns an EAP mes-

sage requesting the identity of the user.

The client returns the

identity, which is then forwarded by the access point to the au-

thentication server, which uses an algorithm to authenticate the

user and then returns an accept or reject message back to the

access point. Assuming an accept was received, the access point

changes the client’s state to authorized and normal transmission

can take place.

The authentication server may use the Remote Authentication

Dial-In User Service (RADIUS), although 802.1x does not specify

it.

WPS

Wi-Fi Protected Setup (WPS), was introduced and developed by

the Wi-Fi Alliance (http://www.wi-ﬁ.org/) to help standardize and

simplify ways of setting up and conﬁguring security on a wireless

network.

Traditionally, users would have to manually create a wireless net-

work name (SSID), and manually enter a creative, yet predictable

security key on both the access point and the client, to prevent

unwanted access to their wireless network.

This entire process

requires the users to have the background knowledge of the

Wi-Fi devices and the ability to make the necessary conﬁguration

changes.

WPS was introduced to relieve and remove all of the guess work of

securing a wireless network by typing a short PIN (numeric code)

or pushing a button (Push-Button Conﬁguration, or PBC). On a new

wireless network, WPS automatically conﬁgures a wireless network

with a network name (SSID) and strong WPA data encryption and

authentication. WPS is designed to support various Wi-Fi certiﬁed

802.11 products ranging from access points, wireless adapters,

Wi-Fi phones, and other consumer electronics devices.

Advantages of WPS:

�

WPS automatically conﬁgures the network name (SSID) and

WPA security key for the access point and the WPS enabled

client devices on a network.

You do not need to know the

SSID and security keys or passphrases when connecting WPS-

enabled devices.

�

No one can guess or ﬁgure out your security keys or passphrase

because the keys are randomly generated. You need not enter

predictable passphrases or long sequences of hexadecimals.

Information and network credentials are securely exchanged

over the air using the EAP, one of the authentication protocols

used in WPA2.

�

WPS has been integrated and supported in Windows Vista.

Currently, Windows Vista only works in Registrar mode.

Disadvantages of WPS:

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145

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ZXDSL 931WII Operation manual

�

It does not support Ad-Hoc mode or network where wireless

devices communicate directly with each other without an ac-

cess point. All Wi-Fi devices in the network must be WPS certi-

ﬁed or WPS-compatible, otherwise you cannot take advantage

of the ease of securing the network.

�

Difﬁcult to add a non-WPS client device to the network because

of the long sequences of hexadecimal characters generated by

the WPS technology. As this technology is fairly new, not every

vendor supports the WPS technology.

Wireless Client requirements

Radio Transmis-

sion

WLAN

devices use electromagnetic waves within a broad, unli-

censed range of the radio spectrum to transmit and receive ra-

dio signals. When a wireless access point is present, it becomes

a base station for the WLAN nodes in its broadcast range. WLAN

nodes transmit digital data using frequency modulation (FM) radio

signals. WLAN devices generate a carrier wave and modulate this

signal using various techniques. Digital data is superimposed onto

the carrier signal. This radio signal carries data to WLAN devices

within range of the transmitting device.

The antennae of WLAN devices listen for and receive the signal.

The signal is demodulated and the transmitted data is extracted.

The transmission method used by the access point is called Di-

rect Sequence Spread Spectrum (DSSS) and DSSS is operated in

a range of the radio spectrum between 2.4 GHz and 2.5 GHz for

transmission. See the expert technical speciﬁcations for more de-

tails on wireless operation.

Antenna

Direct the external antenna to allow optimization of the wireless

link.

If for example the antenna is erect, wireless links in the

horizontal plane are favored.

Note that the antenna characteristics are inﬂuenced by the envi-

ronment, that is, by reﬂections of the radio signal against walls

or ceilings. It is advisable to use the received signal strength as

indicated by the wireless client manager to optimize the antenna

position for the link to a given client. Concrete walls weaken the

radio signal and thus affect the connection.

Range

Range should not be a problem in most homes or small ofﬁces. If

you experience low or no signal strength in some areas, consider

positioning the 931WII in a location between the WLAN devices

that maintains a roughly equal straight-line distance to all devices

that need to access the 931WII through the wireless interface.

Adding more 802.11g access points to rooms where the signal is

weak can improve signal strength.

Radio Channel

The 802.11g standard allows several WLAN networks using differ-

ent radio channels to be co-located.

The Guw5.5Z66-5 supports

multiple radio channels and is able to select the best radio channel

at each startup. You can choose to set the channels automatically

or manually. Different channels overlap. To avoid interference with

another access point, make sure that the separation (in terms of

frequency) is as high as possible.

It is recommended to keep at

least 3 channels between 2 different access points.

146

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Page 153 / 198

Chapter 18 Wireless Conﬁguration

The Guw5.5Z66-5 supports all channels allowed for wireless net-

working. However, depending on local regulations, the number of

channels actually allowed to be used may be restricted, as shown

ABLE

29 R

ADIO

HANNEL

ESTRICTION

Regulatory Domain

Allowed Radio Channels

China

1 to 13

Europe

1 to 13

Israel

5 to 8

Japan

1 to 14

Jordan

10 to 13

Thailand

1 to 14

USA / Canada

1 to 11

Wireless Distribution System

The

WLAN

series of APs use wireless ports to interconnect BSS

areas.

WDS is commonly used in areas requiring multiple APs, where

wiring is not possible or costly, and is used for providing backup

paths between APs.

The number of ports on an AP available for the WDS depends on

the AP model. The 520wl for example, allows up to six WDS links.

The same frequency channels must be used on each end of a WDS

link.

The same PC card that supports a BSS area can be used for a

WDS link.

The packet ﬂow through the WDS is very similar to

the standard DS except it uses the wireless ports instead of the

Ethernet port.

Configure Wireless

Connection

Wireless - Basic

Select

Wireless > Basic

to display the interface as shown in

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ZXDSL 931WII Operation manual

IGURE

162 W

IRELESS

- B

ASIC

This page allows you to conﬁgure basic features of the

WLAN

in-

terface.

You can enable or disable the WLAN interface, hide the

network from active scans, set the wireless network name (also

known as SSID) and restrict the channel set based on country re-

quirements.

is the description of the different options.

ABLE

30 W

IRELESS

ASIC

ONFIGURATION

PTIONS

Field

Description

Enable Wireless

Select

this

check

box

enable

wireless.

If this check box is not

selected,

the

Hide

Access

Point,

Clients

Isolation,

Disable

WMM

Advertise,

SSID,

BSSID,

Coun-

try/Region,

Max

Clients,

Wire-

less – Guest/Virtual Access Points

boxes are not displayed.

Hide Access Point

Select this check box if you want

to hide any access point for your

router, so a station cannot obtain

the

SSID

through

passive

scan-

ning.

148

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Page 155 / 198

Chapter 18 Wireless Conﬁguration

Field

Description

Clients Isolation

When many clients connect to the

same access point, they can ac-

cess each other.

If you want to

disable the access between clients

which

connect

the

same

access

point,

you can select this check

box.

Disable WMM Advertise

Wi-Fi multimedia (WMM) can pro-

vide high-performance multimedia

voice and video data transfers.

SSID

The

SSID

the

network

name

shared among all points in a wire-

less network.

The SSID must be

identical for all points in the wire-

less network.

It is case-sensitive

and must not exceed 32 characters

(use any of the characters on the

keyboard). Make sure this setting

is the same for all points in your

wireless network.

For added se-

curity, you should change the de-

fault SSID to a unique name.

Country/Region

The

name

the

country

with

which your gateway is conﬁgured.

This

parameter

further

speciﬁes

your

wireless

connection.

For

example, the channel adjusts ac-

cording

the

region

adapt

to the frequency provision of the

speciﬁc region.

Max Clients

Speciﬁes

the

maximum

number

of wireless client stations that can

be connected to the AP. Once the

clients exceed the max vlaue, all

other

clients

are

refused.

The

value

range

between

six

and

ten.

Wireless

Guest/Virtual

Access

Points

If you want to make Guest/Virtual

network

function

available,

you

must select those check boxes in

the table below.

In the current

software version, three virtual ac-

cess points can be conﬁgured.

Click

Save/Apply

to save the basic wireless options so that the

changes can take effect.

Wireless–Security

This device is equipped with 802.1X and WPA/WPA2 (Wi-Fi Pro-

tected Access), the latest security standard. It also supports the

legacy security standard WEP.

Conﬁdential and Proprietary Information of ZTE CORPORATION

149

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